Unlock instant, AI-driven research and patent intelligence for your innovation.

Optical scanner configured so a principal ray of an incident beam from a light source to a deflector and a principal ray of a scanning beam from the deflector to a scanned surface travel on same side (or opposite sides) of an optical axis of an optical element(s) having transmissive surfaces both convex (or both concave) toward the deflector in sub-scanning section respectively, and image forming apparatus using the same

a scanning beam and optical scanner technology, applied in optics, instruments, electrical devices, etc., can solve the problems of deteriorating image quality, difficult to completely block ghost light with light blocking member, and difficult to apply anti-reflection coating to plastic lenses, etc., to achieve the effect of high-quality images

Inactive Publication Date: 2008-11-18
CANON KK
View PDF7 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This configuration effectively reduces ghost light incidence on the photosensitive drum, resulting in higher-quality images by ensuring the scanning beam and ghost light are adequately separated, thereby enhancing image recording accuracy and quality.

Problems solved by technology

The area on which the ghost light Rf is incident is developed into a dark line, thereby deteriorating the image quality.
However, in the case of an optical system in which the ghost light and the scanning beam are not sufficiently separated, it is difficult to completely block the ghost light with the light blocking member.
However, it is difficult to apply antireflection coating to plastic lenses, which are commonly used.
In addition, application of antireflection coating increases the cost.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Optical scanner configured so a principal ray of an incident beam from a light source to a deflector and a principal ray of a scanning beam from the deflector to a scanned surface travel on same side (or opposite sides) of an optical axis of an optical element(s) having transmissive surfaces both convex (or both concave) toward the deflector in sub-scanning section respectively, and image forming apparatus using the same
  • Optical scanner configured so a principal ray of an incident beam from a light source to a deflector and a principal ray of a scanning beam from the deflector to a scanned surface travel on same side (or opposite sides) of an optical axis of an optical element(s) having transmissive surfaces both convex (or both concave) toward the deflector in sub-scanning section respectively, and image forming apparatus using the same
  • Optical scanner configured so a principal ray of an incident beam from a light source to a deflector and a principal ray of a scanning beam from the deflector to a scanned surface travel on same side (or opposite sides) of an optical axis of an optical element(s) having transmissive surfaces both convex (or both concave) toward the deflector in sub-scanning section respectively, and image forming apparatus using the same

Examples

Experimental program
Comparison scheme
Effect test

exemplary embodiment 1

[0058]FIG. 1 illustrates a schematic sectional view of an optical scanner according to exemplary embodiment 1 in the main scanning direction (main scanning sectional view). FIG. 2 illustrates a schematic sectional view of the optical scanner according to exemplary embodiment 1 in the sub-scanning direction (sub-scanning sectional view).

[0059]Here, the term “main scanning direction” refers to a direction perpendicular to the rotation axis of the light deflector and the optical axis of the scanning optical system (a direction in which a light beam is swept by the light deflector). The term “sub-scanning direction” refers to a direction parallel to the rotation axis of the light deflector. The term “main scanning section” refers to a plane that is parallel to the main scanning direction and includes the optical axis of the scanning optical system. The term “sub-scanning section” refers to a plane perpendicular to the main scanning section.

[0060]In FIG. 1, reference numeral 1 denotes tw...

exemplary embodiment 2

[0101]FIG. 6 illustrates a schematic sectional view of an optical scanner according to exemplary embodiment 2 in the main scanning direction (main scanning sectional view). FIG. 7 illustrates a schematic sectional view of the optical scanner according to exemplary embodiment 2 in the sub-scanning direction (sub-scanning sectional view). In FIGS. 6 and 7, the same reference numerals are used to designate the same components as those in FIGS. 1 and 2.

[0102]The present exemplary embodiment differs from exemplary embodiment 1 in the following respects:[0103](1) the light source device has a single light emitter;[0104](2) the scanning optical system 6b has three (first, second, and third) scanning lenses 61, 62, and 63;[0105](3) the first and second scanning lenses 61 and 62 are formed of a material with similar optical properties as glass;[0106](4) one of the principal rays of the incident beam and the principal ray of the scanning beam travels on one of the upper and lower side of the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Optical scanners are configured so a principal ray of an incident beam from a light source device to a deflector and a principal ray of a scanning beam from the deflector to a scanned surface travel on the same side (or opposite sides) of an optical axis of an optical element(s) respectively wherein entrance and exit surfaces of the optical element(s) are both convex (or both concave) toward the deflector in the sub-scanning section. In various embodiments, the aforementioned principal rays travel on the same side, and surfaces are convex toward the deflector in the sub-scanning section. In various embodiments, the aforementioned principal rays travel on opposite sides, and surfaces are concave toward the deflector in the sub-scanning section. Embodiments may beneficially separate the scanning beam from ghost light and / or be incorporated in image forming apparatuses.

Description

FIELD OF THE INVENTION[0001]The present invention relates to an optical scanner and an image forming apparatus using the same. In particular, though not exclusively, the present invention relates to an optical scanner suitable for an image forming apparatus having an electrophotographic process.DESCRIPTION OF THE RELATED ART[0002]In a conventional optical scanner used in a laser beam printer (LBP) and so on, a light beam that is optically modulated in accordance with an image signal and emitted from a light source device is periodically deflected by a light deflector, for example, a rotating polygon mirror. The light beam is converged into a spot on a surface of a photosensitive recording medium (photosensitive drum) by a scanning optical system having fθ characteristics, and then the surface of the recording medium is optically scanned to carry out image recording.[0003]FIG. 10 illustrates a schematic view of a conventional optical scanner.[0004]In FIG. 10, a light source device 20...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(United States)
IPC IPC(8): G02B26/08
CPCG02B26/125G02B27/0018H04N1/06H04N1/0635
Inventor SHIMOMURA, HIDEKAZU
Owner CANON KK